TCA9536DGKR

Overview

The TCA9536DGKR is a remote 4-bit I2C and SMBus I/O expander manufactured by Texas Instruments, housed in an 8-pin VSSOP package. It operates within a supply voltage range of 1.65 V to 5.5 V and supports clock frequencies up to 1 MHz (Fast mode plus). The device features four general-purpose I/O ports with configurable input/output selection via registers. It includes software-enabled internal pull-up resistors, polarity inversion capabilities, and an interrupt output function assignable to the P3 pin. The component provides latched outputs for high-current drive and incorporates noise filters on SCL and SDA inputs.

Feature Summary

• Supports I2C and SMBus protocols with Fast mode plus capability up to 1 MHz
• Configurable I/O ports with software-selectable input or output modes
• Integrated interrupt functionality allowing P3 pin repurposing as open-drain output
• Software-resettable registers via I2C General Call command

Applications

• Personal electronics including wearables and mobile phones
• Gaming consoles
• Servers and routers

Procurement Notes

Verify the specific DGKR suffix corresponds to the VSSOP-8 package variant when sourcing. Confirm that the intended application environment remains within the specified -40°C to +125°C operating temperature range. Ensure power supply decoupling meets the thermal and electrical requirements outlined in the datasheet layout guidelines.

Selection Notes

Select this component when a compact 4-bit expansion solution is required for systems utilizing I2C or SMBus interfaces. It is suitable for designs needing 5-V tolerant I/O ports while operating from lower voltage supplies. Consider the VSSOP package size constraints and the availability of the interrupt feature if state change detection is necessary for the system controller.

Part Context

The TCA9536 belongs to the family of remote I/O expanders designed for microcontroller interface extension. Unlike the PCA9536 series which lacks interrupt capabilities, the TCA9536 adds interrupt functionality and supports higher bus speeds. It serves as a bridge between low-pin-count controllers and peripheral devices requiring additional digital lines.

Replacement Considerations

The PCA9536 series offers similar I/O expansion but lacks the interrupt output feature and Fast mode plus support. Verify compatibility regarding register maps and interrupt handling logic when substituting.